Hi, I have a Swinehart mist sprayer PTO model I got used a long time ago for around $1000. It works well and only requires 12 hp at the PTO (most air blast sprayers need 30 or so). Air blast sprayers reduce chemical usage by over half in comparison to "drench " sprayers where most of the spray ends up on the ground, so when you are looking at that $700 bottle of Pristine, they can pay for themselves in a few years. My trees are mostly around 10’ high and 8’ wide and to spray 350 trees takes around 125 gal of spray. less than 1/2 gal per tree and the turbulence whips the leaves around providing better coverage.
Eric